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Thread: Is it recommended to use those lens pens on telescope or eyepiece lens?

  1. #1
    harryhh's Avatar
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    Default Is it recommended to use those lens pens on telescope or eyepiece lens?



    Hi All,

    You know those lens pens with the rubbery pad? Once dust is removed from a lens, is it recommended to use these pens on telescope lenses, eyepieces, and such?

    You could reach inside the tubes of eyepieces or diagonals with those things.

    Harry
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    Hi Harry,

    I use my lens pens on the external surfaces of my EPs only.

    Cheers,
    JT
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    Mostly also on external parts of my eyepieces. kinda worry I might not get something off or smudge something, then everything is blurry.
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    Thanks folks.

    I think one would have to be careful not to rub a piece of dust around with one of those pens, but I do use then on my camera. When they first came out they were highly recommended as I recall.

    I was wondering if they can damage the coatings of multi-coated lenses?

    Harry
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    Hello Harry,

    I am not a good friend of the lens pen, and so far I am not missing a lens pen in my ZEISS cleaning kit.
    Quality optics has hard coatings on the outer surfaces, and these are as a rule specified in the marketing specs.
    The old MgF2 bluish coatings may be eventually wiped away after a frequent use of the lens pen.

    There is also a nonsense video somewhere on the web, showing a guy spitting on an eyepiece, and then applying the lens pen - a sort of fake cleaning technique. But it's good for a lough, both the guy, and what is he doing.

    Best,

    JG
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    I know a lot of people really like the lens pens... but I've never liked the idea of something that relies on you always getting rid of 100% of the crud BEFORE you use it. That cleaning pad looks perfect for bedding in any sharp bit of crud you ever miss and then scratching it over anything you ever clean afterwards. IF - and ONLY IF - you can guarantee you never miss any sharp specks, then you're OK - but I prefer systems where you have a fresh bit of tissue or whatever each time, so you don't have to worry about contamination affecting future cleanings. Maybe that's over cautious - but most of the time I just use one of the Giotto rocket blowers to blow the dust off, and save touching the lens with something for times when there are smears.
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    I've been a photographer since 1974. I've used lens pens form many years on my camera lenses and now on the digital camera sensors. Nobody is more finicky than a photographer about their lenses!! I have never seen any damage of any type from using them correctly. The new pens have a soft brush on one end to wipe off loose dust. The other end is used to "gently" remove material that sticks to the lens. You don't need much force with them and you don't need to grind the dirt or speck off the glass!! If you have stuck on spots then you need to do a wet cleaning. Look up photographic lens cleaning supplies on the net. There are a number of wet cleaning kits on the market.
    Johnny
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    Default Re: Is it recommended to use those lens pens on telescope or eyepiece lens?

    Thanks gunfighter48,

    I'm now remembering more about those pens. A couple of employee's of Chicago's Cook County Forest Preserve was telling me about them years ago. I think the pens were new on the market. The employees took out birding groups and handed out binoculars to those who needed them.

    The pad is a very soft, gentle, non-abrasive material. As gentle as anything you might use on your lens. There is a substance on the pad that cleans/absorbs oils and such. Graphite or carbon or some such. Whichever, the cleaning substance is completely non abrasive. There is another pad inside the cap that is impregnated with the cleaning substance. When you put the cap back on and twist it back and forth just a time or two, fresh cleaning substance in put on the cleaning pad. The cleaning substance is dry, and supposed to be completely safe for any type of lens coating.

    I had forgotten most of this. When I use these pens to clean my camera lens, I clean off the dust first. But, having forgotten how the pens work, I have been using too much pressure on the pad and lens. The pad is not 'polishing' the lens. It is absorbing oils and perhaps other stuff off the lens. You are suppose to use as light a touch as you can. Just enough to keep the pad in contact with the lens.

    I think the thing about lens pens is that they do clean very well, and are very handy in the field. When I use the lens pen on my camera lens as a finishing touch, I get the cleanest, sparklie lenses.

    There is something I noticed years ago when I used lens tissue and a liquid cleaner. You have to hold the damp lens tissue in your fingers and the liquid cleaner invariable picked up oils from the skin. Even though it was only a very little oil, it was transferred to the lens.

    I think I will use the pens on lenses and eyepieces, but only when necessary. Only when there is a visible smudge on the lens. And I will try to remember to use as light a touch as possible. And, if I am going to use the lens pen, I will first take extra care to remove every bit of dust from the lens.

    I worry the same as jerryTheC. I still imagine getting a little piece of dust under that pad.

    Harry
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